Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff52d78dafde594…

MALICIOUS

PDF

71.3 KB Created: 2021-09-24 01:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfbf81028788b1a7b1a3e4680a30edfe SHA-1: 2176fcea2467f5d281b4ee62bf407ea22a075a3f SHA-256: 9ff52d78dafde5944a8412861fc749d173c2ba9b5859ba14012940d99d8522a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities. It also features numerous URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=vellai+yaanai+tamil+full+movie
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613938dcbc2f9---18530097368.pdf
    • http://kaztelcom.kz/ckfinder/userfiles/files/46749608009.pdf
    • http://adasbruiloften.nl/userfiles/file/18816141082.pdf
    • http://aylabawadi.ae/userfiles/file/juxubisuguva.pdf
    • http://xinghui.co/upload/ckimg/files/202109080837017044.pdf
    • http://xutricolor.com/uploadfile/files/siwadidezitonixezarulimo.pdf
    • https://vico-domrep.com/ckfinder/userfiles/files/silawiduniko.pdf
    • http://k-sta.kr/FileData/ckfinder/files/20210924_6D5A9815A65E39FC.pdf
    • http://itps-group.com/uploadfiles/file/8295424032.pdf
    • http://npi-management.org/ressource/site-image/files/63205871983.pdf
    • http://highdesertrent.com/newsite/images/uploads/file/67400103203.pdf
    • http://stefanourso.com/public/userfiles/file/sadoniminumulibebamidux.pdf
    • http://studiosiciliani.eu/userfiles/files/vuxibibuvozag.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613facf0ad183---kukawesujiwutozavi.pdf
    • http://jsdarvin.com/files/43606983877.pdf
    • http://dienlanhhuubinh.com/upload/files/kugavetusudijodokosezuju.pdf
    • http://bjerkelunden.org/content/files/userfiles/file///nomaxosuzawixagasad.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/1619a54c141ddf1587fb979473bafcb8/delerafuzezo.pdf
    • http://jodhpurheritagewalk.com/images/file/xobux.pdf
    • https://implantsdentairesdesmoulins.com/upload/editor/file/bapimirabuv.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/56331147273.pdf
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/61376372444.pdf
    • http://cameralehiep.com/hinhanh_fckeditor/file/kivavis.pdf
    • http://casadiriposomarsala.it/userfiles/files/19317892497.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/dq59qlndfaoc7mbq0bs2bk2d8n/dewonaxozetolukoli.pdf
    • https://safrano.pl/userfiles/file/wokiwa.pdf
    • http://zgic.ru/!upload/files/vapuvarekamab.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6e7.bin
abf3db49af15a69303d44e42ac92c77d91d6b8ab588d6847b2c4f8282ca63498
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E7 10356 bytes
font_01_sfnt_off0000ce48.bin
3ffd8c966970b236ad4a1233f6e7b013a41cac2ad463599d112d103c956ff462
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE48 15976 bytes
font_02_sfnt_off0000f772.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 16792 bytes